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Old 08-03-2003, 06:55 PM
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engine rebuild query re; crank rotation..

i set the crank in, with the rear seal in place, its a 2 pc. rubber seal.... torqued it down, checked the crank for action, it rotates freely almost 1 complete revolution, then it hits a spot where, if you were to give the crank a hard spin with your hand, its stout enough to stop the cranks rotation...it does rotate 360*, but i'm concerned cos this didn't occur til i set the seal in...... i untorqued it, it spun freely, no catch. retorqued it, same small spot to catch on......seal does not look boogered.....no excess sticking out that could be trimmed..
when i was checking clearances, the crank spun freely, no endplay etc..... now that ive torqued it down with the seal in place, it does this..... wth??? is this a problem or simply a seal thing...... do i need to get a new seal and try it out again???

jfc.

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Old 08-03-2003, 06:59 PM
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Remove the seal and torque everything down to spec and try it again. If you still have the same problem it's a problem you need to rectify.

Vince
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Old 08-03-2003, 07:04 PM
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Has this engine been align bored or honed?
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Old 08-03-2003, 07:20 PM
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the block has only been cylinder bored. the crank, with out the seal, fully torqued, spins so free, it'll make you..... nevermind.
but it's fine with out the seal, smooth as glass. put the seal in, torque it down, and it has this slight catch......
the crank is turned .020, but like i said, without the seal in inplace, it does not do this.....
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Old 08-03-2003, 07:55 PM
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DHTIIY BALANCER?

DO you have the harmonic balancer on yet??OBVIOUSLY OR NOTHING COULD SLOW DOWN YOUR CRANK RIGHT? so now the bad news. you just bought your harmonic balancer from summit, the p.o.s. was made in australia and the quality control guy was out surfin bondi bay when your unit went by. if you did buy it from summit, take it to the nearest machine shop and have them turn the snout down to spec and it will be fine thereafter.
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Old 08-03-2003, 08:29 PM
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no balancer yet

i've just set the crank in the journals, with bearings, placed and torqued the caps, and installed the rear seal. no balancer, no rods, no pistons, nada. i felt the "catch" and stopped there.

i can grap the snout, give it a twirl, the crank will spin freely til i get to that one spot, it grabs, but it will turn over the spot......

thanks for the info on the australian balancers, was looking into getting one........
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Old 08-03-2003, 08:47 PM
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It seems all the balancers nowadays are made in China, Spain or Aussieland, they are all too tight on the snout and the seal surface varies. We have been taking .002" out of the centers of all the new ones so they don't split when you pull them onto the crank!
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Old 08-03-2003, 09:09 PM
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Do a runout check on the seal surface of the crank, if it's under .0015" it's OK, anymore and I would cut it. This is a common problem on recut cranks if the machinist wasn't careful or the old surface has a hard spot or high spot. Sometimes a bad center in the crank will make the crank walk while grinding and make a flat spot. If you find a high spot you can hone it out, same goes for nicks.

Have a close look at this sealing surface and mark the tight spot with marker so you can find it when the seal is out. You got a dial indicator Larry?
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Old 08-03-2003, 09:18 PM
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4Jaw

I checked the run out on all the mains, i dont have my spec sheet with me(i'm working ), but i can recall that there was less than .0004" play, i'm thinking that i got the play on the first main, nearest the snout.....

i was there when it was ground, if the machinest's d.i. was accurate, (got a deal, snicker, he'd just replaced his old grinder due to a fire, wanted to show off his new toy, so i'd think it was accurate.....) it shouldn't have been misground....., i mean , i watched every journal be ground, thats what made me go to this guy, he told me i could watch any or all of the work he did to my block, sez alot to me....
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Old 08-04-2003, 03:03 PM
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fixed.

the thrust wasn't set right on the crank shaft..... whew

run out on all but the first main was nil... the first had a mysterious 0.0010"..... wth? piston rings on the way ups overnight air!!!!! now i need to get the truck painted so i can put it in.......... whhoooooo freeaaakkkiinnnnn whhhooooooo......
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